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Haze removing method for large-area background light haze-containing image

A background light, large-area technology, applied in the field of image processing, can solve the problems of low image contrast, dim and unclear images, etc., to achieve the effect of high quality, high algorithm efficiency, simple and flexible operation

Inactive Publication Date: 2014-04-23
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to perform defogging on large-area background light and foggy images, so as to avoid the problems of low image contrast and dark and unclear images after defogging

Method used

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  • Haze removing method for large-area background light haze-containing image
  • Haze removing method for large-area background light haze-containing image
  • Haze removing method for large-area background light haze-containing image

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Embodiment Construction

[0012] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0013] The invention provides a method for defogging a large-area background light foggy image, comprising the steps of:

[0014] S1. Obtain the intensity histogram A of the foggy image, and judge whether the histogram A satisfies a large area of ​​background light, and if so, calculate the abscissa x of the peak value of the background light A ;

[0015] S2. Use the dark channel prior algorithm to defog the image, calculate the histogram B of the defogged image, and determine the coordinates of the glitch (x B , h B );

[0016] S3. Reconstruction histogram B: the retained intensity is less than the abscissa x B For the part, the reconstruction intensity is greater than the abscissa x B , and use a single-increasing convex function for reconstruction;

[0017] S4. Perform histogram specification on the reconstructed histogram B'...

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Abstract

The invention discloses a haze removing method for a large-area background light haze-containing image. The haze removing method comprises the steps of 1) obtaining an intensity histogram A of a haze-containing image, judging whether the histogram A meets the requirement of having large-area background light or not and calculating the horizontal coordinate xA of partial peak values of the background light; 2) haze removing the image by using a dark channel prior algorithm, calculating a histogram B of a haze-removed picture and determining the coordinate (xB, hB) on which burr occurs; 3) reestablishing the histogram B: reserving the part with intensity which is smaller than xB, reestablishing the part with intensity which is larger than xB and performing reestablishment by adopting a monotonic increasing convex function; 4) performing histogram specification to the reestablished histogram and the haze-removed picture to obtain an improved haze-removed picture. The haze removing method for the large-area background light haze-containing image has the advantages that since the dark channel prior algorithm is post-processed through the histogram, the method is simple and flexible to operate; since different parameters are set according to different specific images, the situation that the result of dark channel prior processing is difficult to fine tune is avoided; the algorithm efficiency is higher, the quality of the obtained haze-removed picture is higher and the picture is more close to an actual haze-free picture.

Description

technical field [0001] The invention relates to image processing technology, in particular to a method for defogging large-area background light and foggy images. Background technique [0002] When the camera is shooting outdoors, the quality of the photo is usually affected to varying degrees by the particles suspended in the atmosphere that absorb or scatter the light of the object, and the above phenomenon becomes more obvious in foggy weather. When shooting in foggy weather, due to the interference of a large number of water droplets in the air, on the one hand, the reflected light of the object will be attenuated when it reaches the lens after being absorbed and refracted by the water droplets; A lot of atmospheric light enters the lens at the same time; on the one hand, the color brightness of the object in the picture is relatively dim; When the scene to be acquired contains a lot of background light, the distortion is particularly obvious. [0003] In the field of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 朱青松杨帅
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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